Instances›AWS EC2›c8i-flex›c8i-flex.2xlarge
Compute
vCPUs8
Memory16 GiB
Mem / vCPU2.00 GiB
ProcessorXeon Scalable
Clock speed3.9 GHz
Architecturex86_64
Storage
TypeEBS only
Bandwidth10,000 Mbps
Throughput1250 MB/s
IOPS40,000
Networking
PerformanceUp to 15 Gigabit
Max ENIs4
IPv6Yes
GPUNone
Family sizes
c8i-flex.large2 vCPU · 4 GiB
c8i-flex.xlarge4 vCPU · 8 GiB
c8i-flex.2xlarge8 vCPU · 16 GiB
c8i-flex.4xlarge16 vCPU · 32 GiB
c8i-flex.8xlarge32 vCPU · 64 GiB
c8i-flex.12xlarge48 vCPU · 96 GiB
c8i-flex.16xlarge64 vCPU · 128 GiB
c8i-flex.2xlarge

The c8i-flex.2xlarge pairs 8 vCPU with 16 GiB of RAM, the 2.00 GiB-per-vCPU ratio that marks a compute-optimized instance. It runs on Intel Xeon Scalable (Granite Rapids) at 3.9 GHz, and AWS introduced it in October 2025. ch.vs2.xlarge on Rackspace Spot lines up one-for-one: 8 vCPU and 16 GiB, $0.356/hr on AWS in US East (N. Virginia), from $0.006/hr on Rackspace Spot.

Pricing by region
1 hr
RegionAWS on-demandAWS Spot1-yr Reserved3-yr ReservedRackspace SpotYou save
US East, N. Virginia$0.356$0.126$0.006
$0.350 savings
US Central, Chicagono AWS region$0.061
US Central, Dallasno AWS region$0.041
Hong Kong$0.061
Sydney, Australia$0.465$0.129$0.016
$0.449 savings
London, UK$0.423$0.131$0.021
$0.402 savings
US West, San Jose$0.444$0.124$0.001
$0.443 savings
US Central, Dallas 2no AWS region$0.061
US East, N. Virginia 2$0.356$0.126$0.081
$0.275 savings
When to use it
Good for
  • ●High-traffic web and API serving
  • ●Scientific modelling and simulation
  • ●Ad serving and real-time bidding
  • ●Workloads that fit inside 16 GiB of RAM
  • ●Parallel work that can occupy 8 vCPU
  • ●Network-heavy services — AWS rates this size at Up to 15 Gigabit
Avoid if
  • ●The working set needs more than 16 GiB of RAM
  • ●More than 2.00 GiB of RAM per vCPU is needed — that ratio is fixed for the whole family
  • ●Local NVMe or instance-store disk is a hard requirement
  • ●GPU or FPGA acceleration is needed
  • ●Memory-hungry applications. A memory-optimized family gives more RAM per dollar.
Stop overpaying AWS. This compute costs $260/mo on AWS vs $4/mo on Rackspace Spot.
  • Spot sells spare capacity at market prices. It is the cheapest compute on the internet.
  • Prices are set by supply and demand. You pay what the market decides.
  • Compute is delivered as fully managed Kubernetes. All infrastructure is taken care of.
  • Egress costs $0.01/GB after the free allowance. AWS charges $0.09/GB.
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